• Title/Summary/Keyword: Soil physical improvement

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Effects of Physical Improvement Practices at Plastic Film House Soil (시설재배 토양의 물리성 개선을 위한 처리방법별 효과 비교)

  • Kim, Lee-Yul;Cho, Hyun-Jun;Hyun, Byung-Keun;Park, Woo-Pung
    • Korean Journal of Soil Science and Fertilizer
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    • v.34 no.2
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    • pp.92-97
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    • 2001
  • Soil characteristics and crop productivity was compared between 5 soil physical treatment plots: check, reversion, subsoiling, explosive subsoiling and drainage in salt accumulated Gangseo Fine sandy loam soil from 1999 to 2000. Physical treatments of subsoil improved soil physical properties in the following order, reversion > drainage > explosive subsoiling > subsoiling > check. The effectiveness of physical treatment was sustained to the 2nd year after treatment. Soil moisture content of subsoil was highest in the reversion treatments and decreased in the order of drainage, subsoiling, and check. However there was little difference between treatments. The physical treatments increased fluctuation of soil moisture content. However the crop yield in the physical treatment plots were increased. It was considered that the increase of crop yield was caused by improvement of soil physical properties rather than soil water holding in the soil. An average increase rate of crop yield by physical treatments was 10 to 20 percent.

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Threshold Subsoil Bulk Density for Optimal Soil Physical Quality in Upland: Inferred Through Parameter Interactions and Crop Growth Inhibition

  • Cho, Hee-Rae;Han, Kyung-Hwa;Zhang, Yong-Seon;Jung, Kang-Ho;Sonn, Yeon-Kyu;Kim, Myeong-Sook;Choi, Seyeong
    • Korean Journal of Soil Science and Fertilizer
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    • v.49 no.5
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    • pp.548-554
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    • 2016
  • Optimal range of soil physical quality to enhance crop productivity or to improve environmental health is still in dispute for the upland soil. We hypothesized that the optimal range might be established by comparing soil physical parameters and their interactions inhibiting crop growth. The parameter identifying optimal range covered favorable conditions of aeration, permeability and root extension. To establish soil physical standard two experiments were conducted as follows; 1) investigating interactions of bulk density and aeration porosity in the laboratory test and 2) determining effects of soil compaction and deep & conventional tillage on physical properties and crop growth in the field test. The crops were Perilla frutescens, Zea mays L., Solanum tuberosum L. and Secale cereael. The saturated hydraulic conductivity, bulk density from the root depth, root growth and stem length were obtained. Higher bulk density showed lower aeration porosity and hydraulic conductivity, and finer texture had lower threshold bulk density at 10% aeration bulk density. Reduced crop growth by subsoil compaction was higher in silt clay loam compared to other textures. Loam soil had better physical improvement in deep rotary tillage plot. Combined with results of the present studies, the soil physical quality was possibly assessed by bulk density index. Threshold subsoil bulk density as the upper value were $1.55Mg\;m^{-3}$ in sandy loam, $1.50Mg\;m^{-3}$ in loam and $1.45Mg\;m^{-3}$ in silty clay loam for optimal soil physical quality in upland.

The Effects of Soil Physical Improvement on Rice Yields at Fine Textured Fluvio-Marine Paddy Field (하해혼성(河海混成) 식양질(埴壤質) 답(沓)에서 토양물리성(土壤物理性) 개선(改善)이 수도수량(水稻收量)에 미치는 영향(影響))

  • Jo, In-Sang;Im, Jeong-Nam;So, Jae Don;Lee, Seong-Yong;Choi, Dae-Ung
    • Korean Journal of Soil Science and Fertilizer
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    • v.16 no.2
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    • pp.92-97
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    • 1983
  • This experiment was designed to establish the soil physical improvement practice to increase the rice yields at fine textured fluvio-marine paddy field. After chiseling and trenching the paddy soil, the rice growth and soil physical properties were investigated for 4 years. The results are summarize as follows; 1. The soil physical properties, such as bulk density, hardness, porosity and permeability were prominently improved by trenching and chiseling. 2. There were significant relationships among the soil physical properties, root developments and rice yields. 3. The increasing rates of rice yields by soil physical improvement were about 10%, which is better than 5% of drainage effects. 4. The effects of trenching and chiseling on rice yields were continued to fourth year. Even if trenching effects was better than chiseling the chiseling was considered as a useful treatment for its simple working practice by using a heavy machine. 5. In case of trenching, straw application were increased the rice yields.

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A study on the Effect of Agricultural Industry Supporter for Durability using Waste Shell such as Crassostrea gigas (패각을 이용한 농업용 지속성 담지체의 효과에 대한 연구)

  • Oh, Eun-Ha;Kong, Seung-Dae
    • Journal of the Korean Applied Science and Technology
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    • v.27 no.4
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    • pp.427-436
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    • 2010
  • Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. An experimental study was carried out to investigate the recycling possibility of waste oyster shells, which induce environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this study is to develope eco-friendly binder using waste oyster shells, and to reinforce soils fur soft soil improvement. In this paper, a series of laboratory tests including compressive pot tests were performed to evaluate characteristics of soils treated by developed waste oyster shells with different water content of soils. Based on test results, eco-friendly Supporter manufactured from waste oyster shells were estimated as good resource materials for soft soil improvements. We got the conclusion by a series of experiment, It is verified that change of pH of soil is improved by mixing with oyster shells. The homogenization method for deducing apparent of oyster shells, which can consider micro-structure of mixed soil, is introduced. The improvement treatment leaded to enlarge fluctuation of soil moisture content. The effect of calcium concentration was good though improvement treatment of physical property. In addition, the crop yield in amelioration plots increased. It means that the increase of crop yield was caused by improvement of soil physical properties rather than improvement of calcium concentration.

Effects of Improvement of Soil Physical Property & Diagnostic Fertilization on Yield and N-Use Efficiency in Puddled-Soil Drill Seeding of Rice (토양물리성개선(土壤物理性改善) 및 진단시비(診斷施肥)가 무논골뿌림직파(直播) 벼의 질소이용효율(窒素利用效率)과 수량(收量)에 미치는 영향(影響))

  • Kang, Seung-Weon;Yoo, Chul-Hyun;Han, Sang-Soo
    • Korean Journal of Soil Science and Fertilizer
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    • v.32 no.3
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    • pp.254-260
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    • 1999
  • This experiment was carried out to evaluate the effect of improvement of soil physical property such as deep plowing and chiseling and diagnostic application of N, P, K fetilizers. Latex Coated Urea(LCU), compost, sillicate for increasing yielding and enchancing N-use efficiency in puddled-soil drill seeding of Rice. The soil physical properties, such as bulk density, hardness and porosity were increased by deep plowing and chiseling, as well as chemical propeties were highly enhanced soil productivity due to increase the content of organic matter, available $P_2O_5$ and K as compare with control. The amount of $NH_4-N$ in soil was highly increased by diagnostic fertilization and chiseling, while recovery rate of V fertilizer was the highest at LCU 80% applied with chiseling. The rice yield increased by 23% under the diagnositic application of LCU 80% applied base with chiseling.

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Soil Physical Properties of Upland Soil in relation to Soil Moisture (밭토양의 물리성(物理性)과 수분문제(水分問題))

  • Yoo, Sun-Ho
    • Korean Journal of Soil Science and Fertilizer
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    • v.6 no.1
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    • pp.61-65
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    • 1973
  • Analysis of data in the Official Soil Series Description showed the dominant texture of upland soils is SiL, of which available water range is 21.1% highest among textures. Analyses of data in the N, P, K Trials on Barley in 1964/65-1968/69, and N, P, K and Soil Improvement Trials on upland Crops in 1961-1969 were made to relate fertilizer response to the amount of rainfalls during the growing season. Correlation between nitrogen response and the amount of rainfalls was observed but not between P and K and the amount of rainfalls. Some of physical properties were discussed to seek feasible means for increasing available water.

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The Strength Characteristic of Soil Cemented Mixed with Oyster Shells and Loess (굴패각과 황토를 혼합한 소일시멘트의 강도특성)

  • Lee, Jin-Soo;Lee, Kang-Il;Kim, Chan-Kee;Kim, Hang-Gyu;Kim, Tae-Hoon
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.527-532
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    • 2010
  • Soil-cement has been broadly used for eco friendly pavement, slope protection and soft soil improvement since it used for the increase of soil strength with cement. Recently, additional agents are mixed with existing soil-cement so as to improve specific properties or functions such as strength, color and permeability of it. This study aims at figuring out the physical and mechanical properties of a soil-cement mixed with crashed oyster shell and loess. The study is specially focused on the applicability of oyster shell as an alternative material for sands. To have his objective achieved a series of uniaxial compression tests were conducted. As a result, it appears that usage of oyster shell may have effect on strength improvement of mixed soils.

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Evaluation on the Physical Characteristics of Cement-Type Solidification using Weathered Granite St Yellow Soil as an Aggregate (마사토, 황토를 골재로 이용한 시멘트계 고화재의 물리적 특성 평가)

  • 김특준;김인섭;이종규;추용식;김병익;김남호
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.601-606
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    • 2002
  • This study explored physical properties of a hardened cement and a concrete specimen using a high performance cement type solidification consisting of a weathered granite soil and a yellow soil mainly. Also the development of high performance cement type solidification was purposed for an intensity improvement and a long-term durability. As the experimental results, a mortar used by the weathered granite soil shows positive result, however using the yellow soil as a mortar Shows less positive result at the compressive strength. Also the dynamic modulus of elasticity measurement result, the concrete specimens used by the weathered granite and the yellow soil reached above 90%, so it seems to have the durability of freezing and thawing.

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Economic Evaluation of Crops Grown under Different Soil Improvement Methods in Newly-reclaimed Sloped Land (신개간지(新開墾地) 토양개량방법별(土壤改良方法別) 작물(作物)의 경제성(經濟性) 검정(檢定))

  • Hur, Bong Koo;Kim, Moo Sung
    • Korean Journal of Soil Science and Fertilizer
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    • v.28 no.3
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    • pp.256-260
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    • 1995
  • This study was carried out to select economic-crops according to the improvement methods of newly-reclaimed soils. Silage corn, soybean, Job's tears and sweet potato were cultivated under 6 treatments including integrated improvement plot, control plot, compost plot, subsoiling plot, phosphate plot and lime plot on the Songjeong loam from 1985 to 1988. Crop yields and soil physical properties were investigated throughout the experiment. Soil porosity in the sweet potato plots were highest. In case of cultivated years, those of 4th year were lowest. Averaged yield increasing ratios of silage corn, soybean, job`s tears and sweet potato in the integrated improvement plots were 132%, 29%, 49% and 59%, respectively. And that of 5 soil improved treatments for 4 crops were 53%, 15%, 25% and 38%, respectively. After subtraction of the total expenses of soil conditioners, the economical efficiency of soil improvements were clear in the 4 crops except the compost plot of silage corn. That of sweet potato plot was the highest.

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Study on the Improvement of Potential Acid Sulfate Soil (잠재 산성황산염토양의 개량에 관한 연구)

  • Han, Kang-Wan;Chun, Jae-Chul;Cho, Jae-Young;Kim, Geum-Hee;Ann, Yeoul
    • Korean Journal of Soil Science and Fertilizer
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    • v.29 no.3
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    • pp.249-254
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    • 1996
  • This research was carried out to find the suitable improvement ways of the potential acid sulfate soil(PASS) for rice cultivation through the physical applications such as surface drainage. drainage. soil dressing with common paddy soil, and burial of PASS. In reclamation of PASS the practices of surface drainage and drainage were not effective, but soil dressing with common paddy soil with same ratio and covering with common paddy soil in 30cm deep were effective for rice cultivation without growth injury. Daily drainage practice was most effective for physical reclamation of PASS.

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